Mechanism of turning a billet of tube cold rolling mills

ABSTRACT

A mechanism having a spindle, one end of which carries a device for clamping a billet. The device comprises a washer having wedges on one end and rollers adapted to interact with a guide block at the other end. The device is provided with expansible cams with chamfers arranged relative to one another so that a space is formed between them for periodical introduction of wedges ensuring a mutual displacements of said cams relative to the spindle axis of rotation.

United States Patent [191 Kozhevnikov et al. Jan. 1, 1974 MECHANISM OF TURNING A BILLET 0F [52] US. Cl. 72/250 TUBE COLD ROLLING MILLS [51] Int. Cl B2lb 39/20, B2lb 39/26 [58] Field of Search 72/208, 209, 250, [76] Inventors. Sergei Nlkolaevlch Kozhevnlkov, 72/2l4, 252; 279/121, 57 66, 71:74

Vystavochnaya ulitsa, 3, kv. 73, Kiev; Arkady Semenovich Tkachenko, prospekt Gagarina, 63, [56] References Clted kv. 22, Dnepropetrovsk; Vadim UNITED STATES PATENTS Anatolievich Verderevsky, 1,890,803 12/1932 Coe 72/208 Volgogradsky prospekt, l7], kv. 35, 2,432,566 12/1947 Findlatcr 72/209 Moscow; Jury Ivanovich Cherevik, ulitsa Belostotskogo, 1 l4, kv. l, Dnepropetrovsk; Jury Evgenievich Alexeev, prospekt Pushkina, 25/27, kv. 38, Dnepropetrovsk; Alexandr Grigorievich Bondarenko, ulitsa Universitetskaya, l0, kv. 22, Dnepropetrovsk; Valery Trofimovich Vyshinsky, prospekt K. Marxa, 34, kv. 41, Dnepropetrovsk, all of U.S.S.R.

[22] Filed: Aug. 16, 1972 [2]] Appl. No.: 281,012

Primary ExaminerMilton S. Mehr Att0rneyEric H. Waters et al.

[57] ABSTRACT A mechanism having a spindle, one end of which carries a device for clamping a billet. The device comprises a washer having wedges on one end and rollers adapted to interact with a guide block at the other end. The device is provided with expansible cams with chamfers arranged relative to one another so that a space is formed between them for periodical introduction of wedges ensuring a mutual displacements of said cams relative to the spindle axis of rotation.

6 Claims, 7 Drawing Figures PATENTEDJAH 11974 3.782.163 SHEET 10F 2 MECHANISM OF TURNING A BILLET OF TUBE COLD ROLLING MILLS The present invention relates to tube cold rolling mills, and, in particular, to mechanisms of turning a billet used in such mills.

This invention can be used most efficiently in tube cold rolling mills of large and medium dimensions.

At present, known in the art are devices comprising a spindle disposed in a stationary housing, the end of the spindle carrying a device for clamping the billet. The device is provided with expansible cams mounted in the spindle, designed for clamping the billet with the help of a drive consisting of an air cylinder connected with the expansible cams through a lever system.

In known devices the billet is constantly clamped by the cams, whereas its periodical turning in attained by turning the spindle, which is driven periodically by a motor via a converting means serving to transform continuous rotation of the motor into a periodical turn of the spindle.

Such a design of the spindle necessitates its operation under an intermittent duty, thus causing frequent breakage of its parts, and consequently, idling of the rolling mill.

It is an aim of this invention to overcome the foregoing difficulty.

The principal object of this invention is to provide a mechanism for turning the billet, wherein the spindle is rotated continuously with periodical turning of the billet, thereby increasing the rolling rate.

These and other objects are attained in a device for turning the billet in tube cold rolling mills, comprising a drive spindle mounted in the housing, one end of which comprises a device for clamping the billet with the help of expansible cams, according to the present invention, the clamping device having a washer mounted on the spindle and movable along the latter axis of rotation, to one side of which are secured wedges, the other side having rollers adapted to inter act with a guide block for moving the washer, the spindle end face having a seat to accommodate expansible spring-loaded cams having chamfers of their side surfaces and arranged relative to one another so as to form a space for periodical introduction of wedges ensuring a mutual-displacement of thecams relative to the spindle axis of rotation.

Such a design contributes to an interrupted rotation of the spindle, thereby ensuring periodical turning of the billet and increasing the reliability and longevity of the mechanism.

In order to ensure the double turn of the billet while the spindle makes a revolution through 360, the guide block can be made as a ring-with two profiled recesses arranged in symmetry and mounted in a thrust journal.

To provide for the turning of the billet once the spindle has made a revolution through 360, the guide block can be made as two concentric rings mounted in the thrust journal, eachhaving one profiled recess arranged relative to one another at 180, hereatthe rollers adapted to interact with said rings are disposed asymmetrically to.the spindle axis of rotation.

In order to provide for the adjustment of the mechanism in the course of the rolling mill operation, also, to align it in case of wear out of rollers and contact surfaces of the rings it is prefereable that the thrust journal has a threaded shank adaptedto interact with a gear mounted in bearings in the cover of the housing and meshing with a gear wheel.

To ensure rigid fixing of the thrust journal and prevent it from turning, the latter can be mounted in the housing cover on splines made on its exterior smooth surface.

In order to provide for a linear contact between the rollers and the rings and to preclude slippage between then, the rollers and the surfaces of rings contacting them can be made tapered.

In order that the invention may be clearly understood, one construction in accordance therewith will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a longitudinal section of said mechanism;

FIGS. 2 and 3 show expansible cams with details;

FIG. 4 is a cross-section taken on the line IV-IV in FIG. 1;

FIG. 5 is a version of an embodiment of expansible cams, a cross-sectional view;

FIG. 6 is a representation of a mutual arrangement of rollers and guide block;

FIG. 7 is a version of a mutual arrangement of rollers and guide block.

The mechanism hereabove described comprises a stationary housing 1 (FIG.1), the bearing supports 2 of which carry a hollow spindle 3. One end of the spindle mounts a gear 4 connected with a drive ensuring continuous movement of the spindle. The other end of the spindle 3 has a seat 5 accommodating expansible cams 6, between which a billet 7 is clamped. Along their exterior surface the cams 6 have recesses 8 to accommodate coiled springs 9 which provide for clamping the billet 7. The cams and springs are mounted in a holder 10. The side surfaces of the cams 6 have chamfers l1 (FIG.2 and 3), the cams proper being arranged relative to one another so that their chamfers form a space to accommodate periodically the wedges 12 (FIG.1), rigidly fixed in washer 13, which is connected with the spindle 3 with the help of guide studs 14, mounting springs 15. The wedges l2 ensure reciprocal movement of the cams 6 relative to the axis of rotation of the spindle 3.

The washer 13 is mounted on the spindle 3 so as to move along its axis of rotation in order to ensure that the wedges 12 enter periodically the space formed between the chamfers ll of the cams 6.

Rollers 16 adapted to interact with the guide block 17 ensuring the displacement of the washer 13 along the axis of rotation of the spindle 3 are fixed on the washer 13 on the end opposite to the wedges 12. The clamping force of the rollers 16 effected onto the guide block 17 is adjusted with a spring 15.

The guide block 17 rests in thrust bearings 18 running on splines 19 of the cover 20 of the housing 1. This prevents it from being turned through and ensures its adequate locking in a definite position. In order to adjust the mechanism while the rolling mill operates and to align it in case of wear-out of the rollers 16 and guide block '17, the thrust bearing is provided with a threaded shank 21 adapted to mesh with a gear 22. The latter runs in bearings 23 in cover 20 and meshes with a gear wheel 24.

The housing of the holder 10 (FIG.4) is composed of two halves separated with gaskets 25 used for adjusting the clamping force of billet 7 by the cams 6. Leaf springs 26 serve for setting the holder along the spindle axis of rotation.

In order to ensure complete clamping of the billet 7 with the cams 6, the quantity of latter can be increased to three as shown in F IG.5, with increasing respectively the number of wedges 12.

The double turning of the billet during a turn of the spindle through 360 is provided due to the fact that the guide block 17 (FIG.6) is made as a ring 27 having two profiled recesses 28 arranged in symmetry. The profile of each recess is selected to obtain a curvilinear section 29 conforming with the withdrawal of the rollers 16 from the end face of the spindle 3 in order to withdraw the wedges from the space formed by the cam chamfers; a rectilinear section 30 conforming with the stop of rollers in this position and a section 31 corresponding to the state when the rollers 16 approach the end face of the spindle 3 in order that the wedges enter the space between the chamfers.

To ensure one turn of the billet during the period the spindle turns through 360, the guide block 17 (FlG.7) is made as two concentric rings 32 and 33, each having one profiled recess 34 with sections 35, 36, 37, whereby recesses 34 are similar with recesses 28. The recesses 34 are arranged at 180 deg. relative to one another, while the rollers 16 are located asymmetrically relative to the spindle rotation axis.

In order to provide for a linear contact between the rollers and the rings and to preclude slippage between them, the rollers 16 and the surfaces of rings 27, 32 and 33 are tapered.

The mechanism hereabove described operates as follows.

In order to provide contact between the rollers 16 and the guide block 17 before the mill is started, an adjustment of contact is effected by moving the gear 24 through a required angle. The gear 24 is in mesh with a gear wheel 22 which in rotating displaces the thrust bearing 18 together with the guide block 17 along the axis of rotation of the spindle 3 so as to provide for constant and uninterrupted contact of the rollers 16 with the surface of the ring 27.

The spindle 3 receives its uninterrupted motion through a gear 4 from the motor. The holder 10 and washer 13 move uninterruptedly together with the spindle 3. The washer 13 at the same time moves reciprocatingly due to the interaction of the rollers 16 with the surface of profiled rings 27.

As the rollers 16 are located on taper surfaces of the ring 27, the washer 13 is in its left-hand position (FlG.l), whereat the billet 7 is released, i.e., is not clamped by the cams 6. As the rollers move along the sections 29 of the ring 27, the washer 13 starts moving under the action of spring 15, from the extreme lefthand position to the extreme right-hand position. Hereat the wedges 12 move from the left to the right in the corresponding spaces between the chamfers 11 of the cams 6. The cams 6 hereby approach each other under the action of springs 9 and clamp the billet 7 at the moment the rollers 16 pass the sections 30 of the ring 27. As the rollers move along the sections 30 of the ring 27 the washer occupies its extreme right-hand position, whereat the billet 7 is clamped by the cams 6 and rotates together with the holder 10 and spindle 3. The angle of turn of the billet is defined by the depth of the recess 28. The described operation takes place as the mill stand overcomes extreme positions. When the rollers move along the sections 31 of the ring 27, the washer 13 moves from the right to occupy its extreme left-hand position.

Further the cycle is repeated as hereabove described. Thus the billet 7 turns two times while the spindle turns once.

In case the guide block is made as two concentric rings 32 and 33 with recesses 34, the mechanism operates similarly as described above, excepting that the time required for the rollers 16 to move along the tapered surface of the rings 32 and 33 exceeds the time for moving along similar surfaces of the ring 27.

What we claim is:

l. A mechanism of turning a billet in tube cold rolling mills comprising a housing, a spindle mounted therein for continuous rotation; a means for continuously rotating said spindle; said spindle having a seat on one of its ends; spring-loaded cams mounted in said seat and movable relative to the axis of rotation of said spindle for clamping a billet between the cams; said cams having chamfers on their side surfaces and arranged relative to one another so as to form a space between them; a washer mounted on said spindle beyond said cams for movement along the spindle rotation axis; wedges secured on one side of said washer and entering periodically said space between the chamfers as the washer moves in order to ensure a mutual movement of said cams relative to the spindle rotation axis; a guide block mounted in said housing to interact with rollers to move said washer along the spindle rotation axis.

2. A mechanism as of claim 1, wherein the guide block is made as a ring with two profiled recesses arranged in symmetry and mounted in a thrust journal.

3. A mechanism as of claim 1, wherein the guide block is made as two concentric rings mounted in a thrust journal and each having one profiled recess arranged at relative to one another, whereas the rollers interacting with said rings are arranged asymmetrically relative to the spindle rotation axis.

4. A mechanism of turning a billet in tube cold rolling mills comprising a housing; a spindle mounted therein and able to rotate continuously; a means for continuously rotating said spindle; said spindle having a seat on one of its ends; spring-loaded cams mounted in said seat and movable relative to the axis of rotation of said spindle in order to clamp the billet, placed between the cams; said cams having chamfers on their side surfaces arranged relative to one another so that a space is formed between them; a washer mounted on said spindle beyond said cams and movable along the spindle rotation axis; wedges secured to one side of said washer and entering periodically said space between the cam chamfers as the washer moves in order to ensure a mutual movement of said cams relative to the spindle rotation axis; a cover for said housing; a thrust journal mounted in said cover; a ring with two profiled recesses arranged in symmetry and mounted in said journal and to interact with said rollers to ensure movement of said washer along the spindle rotation axis; said thrust journal having a threaded shank; a gear mounted in bearings in said cover and meshing with said thread for adjusting the contact pattern between said rollers and the ring.

5. A mechanism as of claim 4, wherein the thrust journal is mounted in a housing cover on splines made on the external smooth surface of the journal.

6. A mechanism as of claim 4 wherein the rollers and surfaces of the rings contacting them are tapered.

* l l l 

1. A mechanism of turning a billet in tube cold rolling mills comprising a housing, a spindle mounted therein for continuous rotation; a means for continuously rotating said spindle; said spindle having a seat on one of its ends; spring-loaded cams mounted in said seat and movable relative to the axis of rotation of said spindle for clamping a billet between the cams; said cams having chamfers on their side surfaces and arranged relative to one another so as to form a space between them; a washer mounted on said spindle beyond said cams for movement along the spindle rotation axis; wedges secured on one side of said washer and entering periodically said space between the chamfers as the washer moves in order to ensure a mutual movement of said cams relative to the spindle rotation axis; a guide block mounted in said housing to interact with rollers to move said washer along the spindle rotation axis.
 2. A mechanism as of claim 1, wherein the guide block is made as a ring with two profiled recesses arranged in symmetry and mounted in a thrust journal.
 3. A mechanism as of claim 1, wherein the guide block is made as two concentric rings mounted in a thrust journal and each having one profiled recess arranged at 180* relative to one another, whereas the rollers interacting with said rings are arranged asymmetrically relative to the spindle rotation axis.
 4. A mechanism of turning a billet in tube cold rolling mills comprising a housing; a spindle mounted therein and able to rotate continuously; a means for continuously rotating said spindle; said spindle having a seat on one of its ends; spring-loaded cams mounted in said seat and movable relative to the axis of rotation of said spindle in order to clamp the billet, placed between the cams; said cams having chamfers on their side surfaces arranged relative to one another so that a space is formed between them; a washer mounted on said spindle beyond said cams and movable along the spindle rotation axis; wedges secured to one side of said washer and entering periodically said space between the cam chamfers as the washer moves in order to ensure a mutual movement of said cams relative to the spindle rotation axis; a cover for said housing; a thrust journal mounted in said cover; a ring with two profiled recesses arranged in symmetry and mounted in said journal and to interact with said rollers to ensure movement of said washer along the spindle rotation axis; said thrust journal having a threaded shank; a gear mounted in bearings in said cover and meshing with said thread for adjusting the contact pattern between said rollers and the ring.
 5. A mechanism as of claim 4, wherein the thrust journal is mounted in a housing cover on splines made on the external smooth surface of the journal.
 6. A mechanism as of claim 4 wherein the rollers and surfaces of the rings contacting them are tapered. 